Add 'setup.py docs' alias

Installs 'Sphinx' and dependencies.

CHANGES.txt

@@ -5,6 +5,8 @@ CHANGES
 4.0.0 (unreleased)
 ------------------
 
+- Added 'setup.py docs' alias (installs ``Sphinx`` and dependencies).
+
 - Added 'setup.py dev' alias (runs ``setup.py develop`` plus installs
   ``nose`` and ``coverage``).
 

setup.cfg

@@ -7,3 +7,4 @@ where=src
 
 [aliases]
 dev = develop easy_install zope.proxy[testing]
+docs = easy_install zope.proxy[docs]

setup.py

@@ -77,6 +77,7 @@ setup(name='zope.proxy',
       zip_safe = False,
       extras_require = {
         'testing': ['nose', 'coverage'],
+        'docs': ['Sphinx', 'repoze.sphinx.autointerface'],
       },
       **extra
       )